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// Copyright 2017 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "dawn_native/opengl/PipelineGL.h"
#include "common/BitSetIterator.h"
#include "dawn_native/BindGroupLayout.h"
#include "dawn_native/opengl/Forward.h"
#include "dawn_native/opengl/OpenGLFunctions.h"
#include "dawn_native/opengl/PipelineLayoutGL.h"
#include "dawn_native/opengl/ShaderModuleGL.h"
#include <iostream>
#include <set>
namespace dawn_native { namespace opengl {
namespace {
GLenum GLShaderType(SingleShaderStage stage) {
switch (stage) {
case SingleShaderStage::Vertex:
return GL_VERTEX_SHADER;
case SingleShaderStage::Fragment:
return GL_FRAGMENT_SHADER;
case SingleShaderStage::Compute:
return GL_COMPUTE_SHADER;
default:
UNREACHABLE();
}
}
} // namespace
PipelineGL::PipelineGL() {
}
void PipelineGL::Initialize(const OpenGLFunctions& gl,
const PipelineLayout* layout,
const PerStage<const ShaderModule*>& modules) {
auto CreateShader = [](const OpenGLFunctions& gl, GLenum type,
const char* source) -> GLuint {
GLuint shader = gl.CreateShader(type);
gl.ShaderSource(shader, 1, &source, nullptr);
gl.CompileShader(shader);
GLint compileStatus = GL_FALSE;
gl.GetShaderiv(shader, GL_COMPILE_STATUS, &compileStatus);
if (compileStatus == GL_FALSE) {
GLint infoLogLength = 0;
gl.GetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLogLength);
if (infoLogLength > 1) {
std::vector<char> buffer(infoLogLength);
gl.GetShaderInfoLog(shader, infoLogLength, nullptr, &buffer[0]);
std::cout << source << std::endl;
std::cout << "Program compilation failed:\n";
std::cout << buffer.data() << std::endl;
}
}
return shader;
};
mProgram = gl.CreateProgram();
dawn::ShaderStage activeStages = dawn::ShaderStage::None;
for (SingleShaderStage stage : IterateStages(kAllStages)) {
if (modules[stage] != nullptr) {
activeStages |= StageBit(stage);
}
}
for (SingleShaderStage stage : IterateStages(activeStages)) {
GLuint shader = CreateShader(gl, GLShaderType(stage), modules[stage]->GetSource());
gl.AttachShader(mProgram, shader);
}
gl.LinkProgram(mProgram);
GLint linkStatus = GL_FALSE;
gl.GetProgramiv(mProgram, GL_LINK_STATUS, &linkStatus);
if (linkStatus == GL_FALSE) {
GLint infoLogLength = 0;
gl.GetProgramiv(mProgram, GL_INFO_LOG_LENGTH, &infoLogLength);
if (infoLogLength > 1) {
std::vector<char> buffer(infoLogLength);
gl.GetProgramInfoLog(mProgram, infoLogLength, nullptr, &buffer[0]);
std::cout << "Program link failed:\n";
std::cout << buffer.data() << std::endl;
}
}
gl.UseProgram(mProgram);
// The uniforms are part of the program state so we can pre-bind buffer units, texture units
// etc.
const auto& indices = layout->GetBindingIndexInfo();
for (uint32_t group : IterateBitSet(layout->GetBindGroupLayoutsMask())) {
const auto& groupInfo = layout->GetBindGroupLayout(group)->GetBindingInfo();
for (uint32_t binding = 0; binding < kMaxBindingsPerGroup; ++binding) {
if (!groupInfo.mask[binding]) {
continue;
}
std::string name = GetBindingName(group, binding);
switch (groupInfo.types[binding]) {
case dawn::BindingType::UniformBuffer: {
GLint location = gl.GetUniformBlockIndex(mProgram, name.c_str());
if (location != -1) {
gl.UniformBlockBinding(mProgram, location, indices[group][binding]);
}
} break;
case dawn::BindingType::StorageBuffer: {
GLuint location = gl.GetProgramResourceIndex(
mProgram, GL_SHADER_STORAGE_BLOCK, name.c_str());
if (location != GL_INVALID_INDEX) {
gl.ShaderStorageBlockBinding(mProgram, location,
indices[group][binding]);
}
} break;
case dawn::BindingType::Sampler:
case dawn::BindingType::SampledTexture:
// These binding types are handled in the separate sampler and texture
// emulation
break;
case dawn::BindingType::StorageTexture:
case dawn::BindingType::ReadonlyStorageBuffer:
UNREACHABLE();
break;
// TODO(shaobo.yan@intel.com): Implement dynamic buffer offset.
}
}
}
// Compute links between stages for combined samplers, then bind them to texture units
{
std::set<CombinedSampler> combinedSamplersSet;
for (SingleShaderStage stage : IterateStages(activeStages)) {
for (const auto& combined : modules[stage]->GetCombinedSamplerInfo()) {
combinedSamplersSet.insert(combined);
}
}
mUnitsForSamplers.resize(layout->GetNumSamplers());
mUnitsForTextures.resize(layout->GetNumSampledTextures());
GLuint textureUnit = layout->GetTextureUnitsUsed();
for (const auto& combined : combinedSamplersSet) {
std::string name = combined.GetName();
GLint location = gl.GetUniformLocation(mProgram, name.c_str());
if (location == -1) {
continue;
}
gl.Uniform1i(location, textureUnit);
GLuint textureIndex =
indices[combined.textureLocation.group][combined.textureLocation.binding];
mUnitsForTextures[textureIndex].push_back(textureUnit);
dawn::TextureComponentType componentType =
layout->GetBindGroupLayout(combined.textureLocation.group)
->GetBindingInfo()
.textureComponentTypes[combined.textureLocation.binding];
bool shouldUseFiltering = componentType == dawn::TextureComponentType::Float;
GLuint samplerIndex =
indices[combined.samplerLocation.group][combined.samplerLocation.binding];
mUnitsForSamplers[samplerIndex].push_back({textureUnit, shouldUseFiltering});
textureUnit++;
}
}
}
const std::vector<PipelineGL::SamplerUnit>& PipelineGL::GetTextureUnitsForSampler(
GLuint index) const {
ASSERT(index < mUnitsForSamplers.size());
return mUnitsForSamplers[index];
}
const std::vector<GLuint>& PipelineGL::GetTextureUnitsForTextureView(GLuint index) const {
ASSERT(index < mUnitsForSamplers.size());
return mUnitsForTextures[index];
}
GLuint PipelineGL::GetProgramHandle() const {
return mProgram;
}
void PipelineGL::ApplyNow(const OpenGLFunctions& gl) {
gl.UseProgram(mProgram);
}
}} // namespace dawn_native::opengl